7:09 pm: The Athletics inked left-hander Brett Anderson to a four-year contract through the 2013 season, the team announced on Friday afternoon. The contract includes club options for 2014 and 2015. Financial details were not disclosed.

The extension covers his final two years of pre-arbitration and his first two years of arbitration, while the options consist of his final year in the process and his first year of free agency.

Anderson, 22, was 11-11 with a 4.06 ERA, 1.28 WHIP and a 150/45 K/BB ratio in his rookie campaign with the Athletics last season, emerging as one of the most promising young left-handers in the game. He’s already off to a fantastic start this season, tossing 12 scoreless innings to begin his second year in the bigs.

There’s obviously a bit of an injury risk attached with any young pitcher, especially one who threw 175 1/3 innings in his first major league season, but the Athletics could save millions in the long run.

Paxton, 30, has been among the game’s better starters over the past few years. In 2018, he went 11-6 with a 3.76 ERA and a 208/42 K/BB ratio in 160 1/3 innings. The lefty has two more years of arbitration eligibility remaining after earning $4.9 million this past season.

Sheffield, 22, is the headliner in the Mariners’ return. He made his major league debut in September for the Yankees, pitching 2 2/3 innings across three appearances. Two of those appearances were scoreless; in the third, he gave up a three-run home run to J.D. Martinez, certainly not an uncommon result among pitchers. MLB Pipeline rates Sheffield as the Yankees’ No. 1 prospect and No. 31 overall in baseball.

Thompson-Williams, 23, was selected by the Yankees in the fifth round of the 2016 draft. This past season, between Single-A Charleston and High-A Tampa, he hit .299/.363/.546 with 22 home runs, 74 RBI, 63 runs scored, and 20 stolen bases in 415 plate appearances. He was not among the Yankees’ top-30 prospects, per MLB Pipeline.

Swanson, 25, was selected by the Yankees in the eighth round of the 2014 draft. He spent most of his 2018 campaign between Double-A Trenton and Triple-A Scranton/Wilkes-Barre. Overall, he posted a 2.66 ERA with a 139/29 K/BB ratio in 121 2/3 innings. MLB Pipeline rated him No. 22 in the Yankees’ system.

This trade comes as no surprise as the Yankees clearly wanted to upgrade the starting rotation and the Mariners seemed motivated to trade Paxton this offseason. To the Mariners’ credit, they got a good return for Paxton, as Sheffield likely becomes the organization’s No. 1 prospect. The only worry about this trade for the Yankees is how Paxton will fare in the more hitter-friendly confines of Yankee Stadium compared to the spacious Safeco Field. The Yankees are likely not done adding, however. Expect even more new faces before the start of spring training.